Movincool CMW30 Service Manuals

SERVICE MANUAL

CMW30

Unit Serial Number Range: 0411XXXXCW3 to Present

(From April 2011 to Present)

DocID: 00G00085EA

SERIAL NUMBER LOCATION AND IDENTIFICATION

Nameplate Label Position

Nameplate Label

COOLING AMPS. WITH PUMP

COMPR. OUTPUT

REFRIGERANT/TOTAL CHARGE

DESIGN PRESSURE LO/HI

PART NO./WEIGHT

SERIAL NO.

Month

Model

Sequential

Number

Year

▲▲  XXXX ###

whole or in part, without the written permission of the publisher. DENSO

SALES CALIFORNIA, INC. reserves the right to make changes without

prior notice. MovinCool

®, Office Pro® and SpotCool® are registered

trademarks of DENSO Corporation.

Table of Contents

Operation Section

1. PRECAUTIONS FOR SAFETY

1.1 Foreword. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 Definition of Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 General Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2. SPECIFICATIONS

2.1 Exterior Dimension Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3. CONSTRUCTION

3.1 Exterior Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 Internal Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.3 Basic Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4 Air Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.5 Water Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. REFRIGERATION AND WATER SYSTEM

4.1 Refrigeration and Water System Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

4.2 Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4.3 Condenser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

4.4 Electronic Expansion Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.5 Evaporator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.6 Accumulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.7 High-Pressure Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.8 Water Regulating Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5. ELECTRICAL SYSTEM

5.1 Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

5.2 Control Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

5.3 Relay Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.4 Compressor Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.5 Compressor Overload Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.6 Evaporator Fan Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

5.7 Temperature Thermistor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5.8 Float Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table of Contents

6. CONNECTION AND SETTING

6.1 Power Supply Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

6.2 Wall Mounted Controller (WMC) Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6.3 Field-Supplied Millivolt Wall Thermostat (MWT) Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

6.4 Warning Signal Connection (Output Signal Terminal L+ and L-) . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

6.5 Fire Alarm Control Panel Connection (Input Signal Terminal E+ and E-). . . . . . . . . . . . . . . . . . . . . 36

7. OPERATION

7.1 Wall Mounted Controller (WMC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

7.2 Operational Status Display Control (Only When Connected With WMC). . . . . . . . . . . . . . . . . . . . . 39

7.3 Self-Diagnostic Code Display Operation and Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

7.4 Self-Diagnostic Code Records Display Operation (Only When Connected With WMC) . . . . . . . . . 41

7.5 TEST Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

7.6 Compressor Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.7 Electronic Expansion Valve Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

7.8 Evaporator Fan Motor Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.9 Internal Drain Pump Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

7.10 Anti-Frost Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.11 Fan Motor Reverse Rotation Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7.12 Automatic Restart After Power Interruption (Automatic Recovery Function) . . . . . . . . . . . . . . . . . . 46

Table of Contents

Repair Section

8. TROUBLESHOOTING

8.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

8.2 Self-Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

8.3 Troubleshooting Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

8.4 Initialize Fan Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

8.5 Basic Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

8.6 Inspection of Compressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

8.7 Inspection of Electronic Expansion Valve Control Coil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

8.8 Inspection of Thermistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

8.9 Inspection of Wiring Connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

8.10 Inspection of Refrigeration System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

8.11 Inspection of Water System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

9. DISASSEMBLY

9.1 Parts Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

9.2 Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

9.3 Removal of Evaporator Fan Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

9.4 Removal of Electrical Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

10. REFRIGERATION AND WATER SYSTEM REPAIR

10.1 Repair of Refrigeration and Water System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76

10.2 Removal of Refrigeration and Water System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

10.3 Charging the System with R-410A Refrigerant. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

10.4 Refrigerant Charging Work. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

11. REASSEMBLY

11.1 Reassembly of Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.2 Compressor Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.3 Evaporator Fan Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.4 Wiring Notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

11.5 Perform an Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Operation Section

6

1. PRECAUTIONS FOR SAFETY

1.1 Foreword

• This manual has been published to service the MovinCool CMW30. Use this manual only when

servicing this unit.

1.2 Definition of Terms

1.3 General Precautions

WARNING

• All electrical work should only be performed by qualified electrical technician. Repair to

electrical components by non-certified technicians may result in personal injury and/or

damage to the unit. All electrical components replaced must be genuine MovinCool parts,

purchased from an authorized reseller.

• Disconnect power supply from the unit before performing any service.

• Before replacing any refrigeration and water system components, recover the refrigerant

using standard recovery procedures and equipment, and drain the water from the unit.

• When handling refrigerant, always wear proper eye protection and do not allow the

refrigerant to come in contact with your skin.

• Do not expose refrigerant to an open flame.

• The power supply for this unit should be a dedicated single outlet circuit with a UL

recognized short-circuit and ground-fault protective breaker to prevent electrical shock

from the unit.

• When brazing any tubing, always wear eye protection, and work only in a well ventilated

area.

• Be careful of any sharp edges when working on this unit.

Describes precautions that should be observed in order to prevent injury to

the user during installation or unit operation.

Describes precautions that should be observed in order to prevent damage to

the unit or its components, which may occur during installation or unit

operation if sufficient care is not taken.

NOTE Provides additional information that facilitates installation or unit operation.

WARNING

CAUTION

Operation Section

7

2. SPECIFICATIONS

2.1 Exterior Dimension Diagram

ILL00274-00

UNIT: inch

1.1

29.8

DIA. 14

31.5

16.0

4.0

DIA. 0.6

DIA. 12

43.7

45.4

20.0

10.7

6.5

14.4

10.2

2.4

0.6 0.8

3.4

4.0

0.64.353.8

26.0 17.7

4 x DIA. 0.6

Operation Section

8

2.2 Technical Specifications

ITEM SPECIFICATIONS

Electronic Features Control Wall Mounted Controller (Included)

Set Point

Temperature Range

Max. 95 °F (35 °C)

Min. 55 °F (13 °C)

Electrical Characteristics Voltage Requirement Single-Phase, 208/230 V, 60 Hz

Operating Voltage

Range

Max. 253 V

Min. 198 V

Starting Current 11.5 A

Recommended Fuse Size 20 A

FLA 9.6/8.9 A

MCA 13.5 A

MOP 23 A

LRA 20.6 A

Cooling Capacity and Power Consumption

Air: 80 °F (27 °C), 50 %RH

Water (EWT/LWT): 85 °F/

95 °F (29 °C/35 °C)

Total Cooling Capacity

*1

29400/29400 Btu/h (8640/8640 W)

Sensible Cooling Capacity

*1

20400/20800 Btu/h (6000/6120 W)

Power Consumption

*1

1.93/1.99 kW

Current Consumption

*1

9.6/8.9 A

Power Factor 97/97 %

Air: 75 °F (24 °C), 50 %RH

Water (EWT/LWT): 86 °F/

95 °F (30 °C/35 °C)

Total Cooling Capacity

*1

25200/25200 Btu/h (7380/7380 W)

Sensible Cooling Capacity

*1

21400/22000 Btu/h (6300/6420 W)

Power Consumption

*1

1.95/2.00 kW

Current Consumption

*1

9.6/9.0 A

Power Factor 98/97 %

IEER 17.0

Compressor Type of Compressor Hermetic Swing Inverter

Output Variable

Evaporator Type of Evaporator Plate Fin

Type of Fan Centrifugal Fan

Air Flow High 1000/1060 CFM (1700/1800 m

3

/h)

Low 770/840 CFM (1300/1430 m

3

/h)

Max. External Static Pressure 0.66 IWG (165 Pa)

Motor Output High 180/240 W

Low 84/104 W

Condenser Type of Condenser Water Cooled, Coaxial Coil

Water Flow Rate 7.1 gal/min (27 L/min)

Type of Water Control Refrigerant Discharge Pressure

Operation Section

9

• Specifications are subject to change without notice.

< NOTE >

*1 :With two 20 feet (6.1 m) ducts containing one 90 ° bend each, supply grill and return grill with filter (0.30 IWG (75 Pa)

external static pressure) on high fan speed.

*2 :Confirm pressure drop of duct, grills, and filter with manufacture's specifications.

*3 :Measured at 3 feet (1.0 m) under the ceiling with evaporator duct and ceiling tile.

Refrigerant Refrigerant Control Electronic Expansion Valve

Type R-410A

Amount 2.31 lb (1.05 kg)

Water Connection Water Inlet and Outlet (Unit side) 3/4 in (19 mm) NPT Female

Signal Connection Fire Alarm Input (Signal Type) • No-voltage contact input

• Contact resistance less than 100 ohm

Warning Signal Output 2 A at 30 V DC/AC max. with resistive load

Dimension W x D x H Without Flange 45.4 x 31.5 x 20.0 in (1154 x 800 x 511 mm)

With Flange 49.4 x 35.4 x 20.0 in (1254 x 900 x 511 mm)

Weight Net 236 lb (107 kg)

Shipping 271 lb (123 kg)

Internal Drain Pump

Capacity

Pump Rate 5.0 gal/h (19 L/h)

Head 4 ft (1.2 m)

Operating Condition Range Inlet Air

Temperature

Max. 95 °F (35 °C), 50 %RH

Min. 55 °F (12 °C), 50 %RH

Entering Water

Temperature

Max. 115 °F (46 °C)

Min. 45 °F (7 °C)

Water Pressure 150 psi (1034 kPa) or less

Recommended Water Flow Rate 7.1 gal/min (27 L/min)

Maximum Duct Length

*2

Cold Duct 120 ft (36.6 m)

Maximum Sound Level

*3

55 dB(A)

Safety Devices Compressor Overload Protector Included

Fan Motor Overload Protector Included

Freeze Protection Thermistor Included

Overflowing Protection Switch Included

Automatic Restart (Power Interruption) Included

Compressor Time Delay 120 sec

High Pressure Interruption Included

Signal Input/Output Included

Control Devices Temperature Control Included

Programmable Timer Included

Two Speed Fan Included

Inverter Compressor Included

ITEM SPECIFICATIONS

Operation Section

10

2.3 Characteristics

• Value range for each EWT shown in the graphs is based on the compressor speed.

• EWT shown in the graphs is an abbreviation of "Entering Water Temperature".

(1) How to read the characteristics

ILL00357-01

Evaporator

Inlet Air Dry Bulb Temp. °F (°C) Cooling Capacity at 7.1 gal/min (27 L/min) (x10

3

Btu/h)

Evaporator Inlet Air Wet Bulb Temp. °F (°C)

10

5

15

20

25

30

35

40

95 (35)

86 (30)

77 (25)

68 (20)

59 (15)

50 (10)

50

(10)

59

(15)

68

(20)

77

(25)

41

(5)

< Example >

Condition:

Evaporator Inlet Air Dry Bulb: 77 °F (25 °C)

Evaporator Inlet Air Wet Bulb: 59 °F (15 °C)

EWT: 85 °F (29 °C)

Cooling Capacity:

Max: 21000 Btu/h

Min: 9000 Btu/h

EWT: 85 °F (29 °C)

EWT: 115 °F (46 °C)

EWT: 45 °F (7 °C)

Operation Section

11

(2) Cooling capacity curve

< NOTE >

Cooling capacity listed at water flow rate of 7.1 gal/min (27 L/min). Water flow rate has small effect on

cooling capacity. (Approx. 1 % effect at the range from 4.0 gal/min (15 L/min) to 10.0 gal/min (38 L/min).)

ILL00358-02

Evaporator

Inlet Air Dry Bulb Temp. °F (°C) Cooling Capacity at 7.1 gal/min (27 L/min) (x10

3

Btu/h)

Evaporator Inlet Air Wet Bulb Temp. °F (°C)

10

5

15

20

25

30

35

40

95 (35)

86 (30)

77 (25)

68 (20)

59 (15)

50 (10)

50

(10)

59

(15)

68

(20)

77

(25)

41

(5)

EWT: 85 °F (29 °C)

EWT: 115 °F (46 °C)

EWT: 45 °F (7 °C)

Operation Section

12

(3) Power consumption curve

< NOTE >

Water flow rate is 7.1 gal/min (27 L/min).

ILL00359-01

Evaporator

Inlet Air Dry Bulb Temp. °F (°C) Power Consumption at 7.1 gal/min (27 L/min) (kW)

Evaporator Inlet Air Wet Bulb Temp. °F (°C)

1.0

0.5

1.5

2.0

2.5

3.0

95 (35)

86 (30)

77 (25)

68 (20)

59 (15)

50 (10)

59

(15)

68

(20)

77

(25)

86

(30)

95

(35)

50

(10)

EWT: 85 °F (29 °C)

EWT: 45 °F (7 °C)

EWT: 115 °F (46 °C)

Operation Section

13

(4) Current consumption curve

< NOTE >

Water flow rate is 7.1 gal/min (27 L/min).

ILL00360-01

Evaporator

Inlet Air Dry Bulb Temp. °F (°C) Current Consumption at 7.1 gal/min (27 L/min) (A)

Evaporator Inlet Air Wet Bulb Temp. °F (°C)

2

0

4

6

10

8

14

12

16

95 (35)

86 (30)

77 (25)

68 (20)

59 (15)

50 (10)

59

(15)

68

(20)

77

(25)

86

(30)

95

(35)

50

(10)

EWT: 85 °F (29 °C)

EWT: 45 °F (7 °C)

EWT: 115 °F (46 °C)

Operation Section

14

(5) Cool air temperature difference curve

< NOTE >

Water flow rate is 7.1 gal/min (27 L/min).

ILL00361-01

Temperature Difference Between

Evaporator Inlet and Outlet Air (Delta-T) °F (°C)

10.8 (6)

7.2 (4)

3.6 (2)

14.4 (8)

18.0 (10)

21.6 (12)

25.2 (14)

Evaporator

Inlet Air Dry Bulb Temp. °F (°C)

Evaporator Inlet Air Wet Bulb Temp. °F (°C)

95 (35)

86 (30)

77 (25)

68 (20)

59 (15)

50 (10)

50

(10)

59

(15)

68

(20)

77

(25)

41

(5)

EWT: 85 °F (29 °C)

EWT: 115 °F (46 °C)

EWT: 45 °F (7 °C)

Operation Section

15

3. CONSTRUCTION

3.1 Exterior Components

ILL00275-00

Cool Air Exhaust

(12.0 in.Dia.Flange)

Connection For Optional

Condensate Pump

Evaporator (Room)

Air Intake

(14.0 in.Dia.Flange)

Service Panel

Signal Wire Inlet

Water Outlet

(3/4 in NPT Female)

Power Cord Inlet

Stop Switch

Condensate Pan Drain For Gravitational Drain/Maintenance

Water Inlet

(3/4 in NPT Female)

Wall Mounted Controller/

Millivolt System Wire Inlet

Mounting Holes

Drain Pipe For Pump

AC Fan Motor

Fixing Position

For Optional

Condensate Pump

Operation Section

16

3.2 Internal Structure

ILL00276-00

AC Fan Motor

Compressor

Overload Relay

Accumulator

High-Pressure

Switch

Electronic

Expansion Valve

Evaporator

Evaporator Fan

Evaporator Fan Motor

Compressor

Condenser

Control Box

Water Regulating Valve

Operation Section

17

3.3 Basic Construction

• This unit is compact in construction because of

the condenser and evaporator being enclosed

in one unit. The interior of the unit is divided

into two sections. One section contains the

evaporator which cools room interior air. The

other section is comprised of the condenser,

compressor and control box.

3.4 Air Flow

• Air taken in from the room air intake is cooled

by the evaporator and then blown through the

cool air supply.

3.5 Water Flow

• This unit has two water connectors on the rear panel.

• Water is flown in from the water inlet and extracts the heat from the water cooled condenser.

Then the water is flown out from the water outlet.

ILL00279-00

CondenserControl Box

Evaporator

Evaporator Fan MotorWater Regulating Valve

ILL00280-00

Room

Air Intake

Cool Air

Supply

(Evaporator)

Operation Section

18

4. REFRIGERATION AND WATER SYSTEM

4.1 Refrigeration and Water System Construction

The component parts of the refrigeration and water system include the following:

• Compressor, Evaporator, Condenser, Accumulator, Electronic expansion valve, High-pressure

switch, Water regulating valve

These parts are all connected by copper piping. All the connections are brazed except the flare

connections of the water regulating valve.

ILL00278-00

Compressor Suction Pipe

(Insulated)

Connecting Pipe

Evaporator

Inlet Pipe

Evaporator Outlet

Pipe Assembly

Evaporator

Electronic Expansion Valve

Compressor

Accumulator

Condenser

Water Outlet Pipe

Water Regulating Valve

Water Inlet Pipe

Condenser

Outlet Pipe

Condenser Inlet Pipe

Compressor Discharge Pipe

High-Pressure Switch

Operation Section

19

ILL00277-01

MF2

(Evaporator

Fan Motor)

Condenser

Water

Inlet

Water

Outlet

EXV

(Electronic Expansion Valve)

Compressor

HPRS

(High-Pressure Switch)

CTS2

(Evaporator Pipe

Inlet Thermistor)

Water Regulating Valve

Evaporator

Accumulator

OLC (Compressor Overload Relay)EWTS (Entering Water Thermistor)

CTS3 (Evaporator Pipe Outlet Thermistor)

RTS2

(Evaporator Inlet

Air Thermistor)

CTS1

(Condenser Thermistor)

Flow of Refrigerant

Flow of Water

RTS1 (WMC Room Thermistor)

Wall Mounted Controller (WMC)

Operation Section

20

4.2 Compressor

• This unit is equipped with a variable speed compressor, which is driven by state of the art

inverter technology.

• A variable speed compressor automatically adjusts its speed as the heat load in the room

changes. With its soft start up, a variable speed compressor reduces start up wear on the

compressor and eliminates in-rush current resulting in no dip in the power supply.

• As an AC power signal is supplied to the inverter circuit, it is then rectified and converted into a

DC power signal with modulated frequency. This modulated frequency controls the speed of the

compressor.

• As the compressor speed decreases, the amount of refrigerant entering the evaporator also

decreases. This results in a more comfortable environment as the unit provides the appropriate

amount of desired cooling. As a result, the room is controlled with a much smaller temperature

swing than traditional control methods.

(1) Compressor construction

• The construction of a swing type compressor is

divided into two mechanisms; the drive

mechanism (compressor motor), and the

compression mechanism (compressor). When

the rotor shaft of the motor (drive mechanism)

turns, the piston (compression mechanism)

rotates to compress the refrigerant.

(2) Basic compressor operation

• The piston (compression mechanism) is set

eccentrically with a certain distance given from

the axis of the center of the cylinder. The piston

turns to compress the refrigerant in the space

between the cylinder and eccentrically

mounted piston. A swing bush absorbs the

lateral blade movement under piston action.

The blade partitions the space between the

suction side and the discharge side to keep

compressed refrigerant from returning to the suction side. There is no suction valve. The

discharge valve is designed not to open until the pressure of the refrigerant within the cylinder

reaches or exceeds discharge side pressure. As a result, the discharge valve prevents the

backward flow of refrigerant gas.

ILL00281-00

I003184

Discharge

Orifice

Cylinder

Swing Bush

Suction Orifice

Discharge Valve

Shaft

Piston

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Movincool CMW30 Service Manuals

Movincool CMW30 Service Manuals

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